(1. 湘潭大學(xué) 材料科學(xué)與工程學(xué)院，湘潭 411105； 2. 湘潭大學(xué) 材料設(shè)計(jì)及制備技術(shù)湖南省重點(diǎn)實(shí)驗(yàn)室，湘潭 411105； 3. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 采用燒結(jié)破碎法制備了FeB/Co金屬陶瓷粉末，探討活性燃燒高速燃?xì)鈬娡?AC-HVAF)制備的FeB/Co涂層中Co含量對(duì)FeB/Co涂層孔隙率、硬度、結(jié)合強(qiáng)度、抗熱震性能和磨粒磨損性能等的影響，研究FeB/Co涂層在熔融鋅液中的腐蝕情況，分析FeB/Co涂層在鋅液中的失效機(jī)理。結(jié)果表明：隨著粘結(jié)相Co含量的提高，涂層致密度提高；當(dāng)Co含量由8%增加到17%(質(zhì)量分?jǐn)?shù))時(shí)，涂層的孔隙率降低，涂層硬度先提高后降低，涂層結(jié)合強(qiáng)度提高，涂層抗熱震性能先提高后降低。與316L不銹鋼基底材料相比，F(xiàn)eB/Co涂層具有更優(yōu)異的耐鋅液腐蝕性能及耐磨粒磨損性能；FeB/Co涂層在鋅液中的潤(rùn)濕性很差，相比Co含量為8%和17%的涂層，Co含量為12%的涂層具有最佳的耐蝕性能。隨著腐蝕的進(jìn)行，涂層局部出現(xiàn)宏觀(guān)裂紋，腐蝕沿著裂紋進(jìn)行并形成脆性(Fe,Co)Zn13相，導(dǎo)致涂層剝落并漂移到鋅液中，從而使涂層失效。
關(guān)鍵字: AC-HVAF；FeB/Co；涂層；鋅液腐蝕
（1. School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China; 2. Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Xiangtan 411105, China; 3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:FeB/Co cermet powder was prepared by the sintered and crushed process. The effects of Co on the porosity, hardness, adhesion, thermal shock resistance and the abrasive wear persistance of the FeB/Co coating deposited by AC-HVAF were investigated. Both the corrosion condition and failure mechanism of FeB/Co coating in the molten zinc were studied detailedly. The results show that the powder density increases with increasing Co content. With Co content ranging from 8% to 17% (mass fraction), the porosity of the coating reduces while the adhesive strength is improved, both the hardness and the shock resistance firstly increase and then decrease. In addition, compared with the base material of 316L stainless steel, the FeB/Co coating shows excellent corrosion resistance in liquid zinc and abrasive wear property. Because the wetting property of FeB/Co coating in liquid zinc is poor, FeB/Co coating shows high durability in it. Also, the coating with 12% Co has the best corrosion resistance compared with those coatings with 8% Co and 17% Co, the macroscopic crack emerges with the passage of time, which results in the formation of brittleness (Fe,Co)Zn13 phase, and liquid zinc will lead to peeling the coating and then drifting into the liquid zinc, as a result, the coating is failed.
Key words: AC-HVAF; FeB/Co; coating; corrosion of liquid zinc
